HG9910M from HGSEMI, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	VIN	power_in	Input voltage supply, 8V to 450V DC. Absolute maximum 470V. Feeds the internal linear regulator that generates VDD.
2	CS	input	Current sense input. Senses the LED string / MOSFET source current via an external sense resistor. Internal pull-in threshold is 250 mV typical (225-275 mV). Absolute maximum -0.3V to +15.8V.
3	GND	power_in	Device ground reference for all internal circuitry.
4	GATE	output	Gate drive output for the external switching MOSFET. High output at VDD (7.5V nom), rise/fall time ~30 ns typ into 500 pF. Absolute maximum -0.3V to +15.8V.
5	PWMD	input	Low-frequency PWM dimming pin, also functions as enable input. Internal 100kΩ (50-150kΩ) pull-down to GND. VIL max 1.0V, VIH min 2.4V. Accepts 0-100% duty cycle up to a few kHz.
6	VDD	power_out	Internally regulated supply voltage output, 7.5V nominal (7.0-8.0V). Can source up to 1mA for external circuitry. Requires an external storage capacitor to hold up the rail near AC input zero-crossings. Absolute maximum 13.5V.
7	LD	input	Linear dimming input. Adjusts the current-sense comparator threshold (voltage range 0 to 250 mV) to modulate LED current linearly. Absolute maximum -0.3V to +15.1V.
8	ROSC	input	Oscillator programming pin. An external resistor from this pin to GND sets the PWM switching frequency (e.g. 1.00 MΩ → ~25 kHz, 226 kΩ → ~100 kHz, up to ~300 kHz).

Key specifications

Parameter	Value
Manufacturer	HGSEMI
Package	SOIC-8
Category	LED-drv
Pins	8

Ordering variants

Same part, different packaging or reel option.

HG9910MM/TR
HG9910MM
HG9910MN

CAD (KiCad official)

Symbol: HG9910M
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: HGSEMI datasheet (8 pp, sha256 edceff046e76256f, retrieved 2026-08-17, tier: lcsc)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF